Defined internal combustion engine operation in vehicles having a hybrid drive

Abstract

A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive.

Description

BACKGROUND INFORMATION[0001]Various functionalities within a controller for internal combustion engines, such as diagnoses or adaptations, require defined operating states of the internal combustion engine, such as idling, or specific load / rotational speed profiles, in order to be able to run. If such operating states do not occur during a driving cycle, the functions are also unable to run.[0002]A method for operating a vehicle drive and a device for implementing the method are described in German Patent Application No. DE 10 2004 0445 507, filed on Sep. 15, 2004. A method for operating a vehicle drive is described, the vehicle drive having at least one internal combustion engine and at least one electric machine mechanically coupled to the at least one internal combustion engine as well as an energy accumulator actively connected to the electric machine and / or the internal combustion engine. The at least one internal combustion engine and the at least one electric machine generate...

AI Technical Summary

Benefits of technology

This approach enables continuous operation of diagnostic and adaptation procedures without interruptions, maintaining efficiency and reducing nitrogen oxide emissions, while minimizing infrastructure expansion and interface complexity.

Problems solved by technology

If such operating states do not occur during a driving cycle, the functions are also unable to run.

A rate of change of optimal setpoint torque MVM opt of the internal combustion engine is limited.

In modern internal combustion engines, various operating points may be problematic with regard to exhaust emissions and fuel consumption.

However, the ignition angle displacement brings reduced efficiency.

In connection with overrun fuel cutoffs, increased nitrogen oxide emissions may arise due to surplus oxygen in the catalytic converter.

Also, the operation of self-igniting internal combustion engines at high torques is expected to result in increased blackening rates and nitrogen oxide emissions; in contrast, operation of self-igniting internal combustion engines at low torques brings the risk that the catalytic converter will cool down.

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